fig2
![Evaluation of asymmetric poly(vinylidene fluoride)-coated polyimide separator with three-dimensionally homogeneous microporous structure for high-safety lithium-ion battery](https://image.oaes.cc/b8ed5c91-a6ff-46da-8157-7457583821ac/em30143.fig.2.jpg)
Figure 2. SEM images of (A) the pristine PI film and (B-F) the surface and cross-sectional SEM images of API/PVDF-SiO2, (B) the unmodified side, (C) the modified side, (D) the upper section, (E) the overall cross-section and (F) the lower section.